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• <br />(c) Scott, Taylor and others, "Geologic map of the Pueblo 1° X 2° <br />quadrangle, south-central Colorado", U.S.G.S., 1978. <br />(d) Matuszczak, R., "Trinidad sandstone Interpreted, evaluated, In <br />Raton basin, Colorado-New Mexico", The Mpartaln Geologist, V. 6, No. 3, <br />p. 119-124. <br />(e) Harr, T., U.S.G.S., Denver, personal corrm~mication November <br />20, 1981. <br /> <br />Aquifer testing and analysis using VermeJo Formation monitoring <br />wells was conducted by Western Engineers, Inc. in October, 1981. Well <br />yields and locations for the general area were obtained from the Records <br />Section, Office of the State Engineer, Colorado Department of Natural <br />Resources. <br />• Pierre Shale - The oldest geologic unit which affects the <br />groundwater flow systems In the synclinal basin Is the Pierre Shale. <br />This olive-gray clayey, silty, sandy marine shale contains bentonlte <br />beds (b) and crust be considered an Impermeable base for flaw systems In <br />the strata above. The Pierre Shale is approximately 3,900 feet thick <br />near Canon City (e) and 1s the producln9 horizon 1n the Florence o11 <br />field (b). No use of ground water fran the Pierre Shale is known In the <br />area. Due to the marine depositional environment and extremely low <br />hydraulic conductivity of bentonitie shales, ground water fran this unit <br />could be expected to be highly saline with very poor well yields. <br />Trinidad Sandstone - Immediately overlying the Pierre Shale Is Che <br />Trinidad Sandstone, a yellowish ray fine to medT.um-grained <br />cross-stratified sandstone which may be as much as 90 feet thick In the <br />basin (b). It marks the bottom of the coal-bearing VerreJo Formation <br />(a) and Is expected to be crone permeable than either the VermeJo <br />Formation or the Pierre Shale. Data on the Trinidad Sandstone from the <br />• Raton basin Indicate pertneabllities of 1 to 200 mlllldarcys (10-2 to 10 <br />gallons per day per foot2 or 10-3 to 10-1 feel per day) as determined <br />from laboratory testing of outcrop samples In anticipation of oil and <br />9 <br />